ButtonToggle

ButtonToggle (FB)

FUNCTION_BLOCK ButtonToggle

Short description

Switching element with button and central control. Typical use: light pushbutton and light output.

Representation

Interfaces

Inputs

Name	Data type	Value range	Initial value	Function
xButton	BOOL			Input - control button
xCentralOn	BOOL			Central switch-on
xCentralOff	BOOL			Central switch-off

Outputs

Name	Data type	Value range	Initial value	Function
xOut	BOOL			Enable - output

Setpoints / Parameters

Name	Data type	Value range	Initial value	Function
xButtonVisu	BOOL		FALSE	Function like xButton

Function description

General

The function block is basically used for the direct control of the enable - output xOut depending on the rising edges at the inputs xButton (= control button), xCentralOn (= central switch-on), xCentralOff (= central switch-off) and the setpoint / parameter xButtonVisu. Each rising edge at the input - control button xButton and / or at the setpoint / parameter xButtonVisu toggles the output xOut to the opposite state, provided no central control takes place. If no rising edges are detected, the state of the enable - output xOut does not change.

Truth table

xButton or xButtonVisu	xCentralOn	xCentralOff	xOut	Note
FALSE, TRUE, L/H	FALSE, TRUE, L/H	FALSE, TRUE, L/H	unchanged	Inputs not active
L/H	FALSE, TRUE, L/H	FALSE, TRUE, L/H	FALSE > TRUE, TRUE > FALSE	State change at the output
FALSE, TRUE, L/H	L/H	FALSE, TRUE, L/H	TRUE	Central switch-on
FALSE, TRUE, L/H	FALSE, TRUE, L/H	L/H	FALSE	Central switch-off
L/H	L/H	FALSE, TRUE, L/H	TRUE	Central switch-on (higher priority)
L/H	L/H	L/H	FALSE	Central switch-off (highest priority)

Legend: L/H … rising edge, H/L … falling edge

CODESYS

InOut:

Scope	Name	Type	Initial
Input	xButton	BOOL
Input	xCentralOn	BOOL
Input	xCentralOff	BOOL
Input Const	xButtonVisu	BOOL	FALSE
Output	xOut	BOOL